Dental plugger.



No. A'7|2,3l3.. Patented Nov. 4, |902.

F. w. Koma. A DENTAL PLUGGER.

(Appliation lerl Nov. 5, 1900.!

(No Model.)

E lllll ZX MTA/6655,

UNITED STATES PATENT OFFICE,

FREDERICK WM. Koma, for CLEVELAND, oHro.

DENTAL 'PLUGGERS SJSECJLFIGAEIQN forming part of Letters Patent No.` 712,813, dated November ,4, 1902.

Application filed November 5, 1900. Serial No. 35,451. (No modei.)

To alt whom t may concern:

Be it known that I, FREDERICKWILLIAM KORB, a citizen of the United States, residing at Cleveland, Cuyahoga county, Ohio, have invented certain new and useful Improvements in Dental Plugg'ers, of which the following is a specification that will enable those skilled in the art to which myinvention pertains to make and use the same.

My invention relates to denial pluggers of the class operated by a revolving shaft, which may be driven by a dental engine or other suitable means. Its objects are vto provide an instrument in which the line of the plugger-tooland the direction of its blow may be at an angle to the axial line of the supporting-handle and its driving-spindle and in which said angle may be fixed permanently or through a modification varied at pleasure, to multiply the number.' of reciprocations of the plugger-tool over the revolutions of the actuating spindle, kand toconstruct a plugging instrument that will be simple, durable, easily handled, and cheaply made.

My invention consists in the various com'- binations of parts and specific constructions hereinafter set forth in this specification and the accompanying drawings, forming a part hereof, and particularly pointed out in the claims.

In the drawings I have shown the features of my inventionin the forms now considered most desirable by me; but changes might be madetherein andsome ofthe parts used Without others Within the skill of a good mechanic and not requiring the exercise of invention without departing from the spirit of my invention as set forth in the claims at the end of this specification.

Figure 1 is a central longitudinal section through a portion of an instrument embody-` ing my invention in the form of a iixed rightangular dental plugger. Fig. 2' is a transverse section of the'sa'me on the line 2 of Fig. l. Figs and 4 are detachedviews of the reciprocating tool-holder and the plugger carried thereby. Fig. 5 is an enlarged view of the'upper end of the tool-holder and the cam whichactuates it.

My invention consists of a plugger-tool holder A, actuated by cams B, which are mounted upon a shaft C, placed at an angle to the axis of the tool-holder (preferably a rightangle) and operating to drive the holder outwardly, its return being eected by a Aspri ng D, the general arrangement being such may be driven byadeutalengine in the usual way or by any other suitable means. This spindle is mounted in a bearing e in the base of the haudpiece and alsoin a bearingfin arplug F, screwed into the outer end of a casingG. This casing is screwed onto the end of the base and is locked in position by a check-nut or thimble H, this construction admitting of the endwise adjustment of the bearings, as will be readily understood. The @am is preferably divided into two parts by a deep groove, across which they are connected by a neck b concentric with the spindle E. Each part of the cam Vis provided with two or more indentations b (four are shown in the drawings) of any desired configuration that will carry ont my invention. The upper end of the tool-holder is slightly fiattened at its sides to lit between the cams and is slotted, as at a, to embrace by its forks the neck b of the spindle E, which serves as a lateral guide to or bearing for the holder. Immediately below the slot a cross-pin I is secured in the holder, its projecting ends lying in contact with the cam-surfaces at each side of the holder. These ends are preferably cut away on their under sides and flattened to provide more space below the pin and to form a suitable seat for the spring D, which lifts the holder. The casing is formed with a tubular side socket g, into which is screwed a plug J, which constitutes a second bearing and guidefor the holder and also an abutment for the lower end of the spring I).

The plugger tool-K andl its holder may be made of a single piece, if desired, but I prefer to make them separately and provide the tool with a tapering top 7o to engage a similarly-shaped socket in the holder, where it is held by frictional contact only. This enables me to use plugger-tools of varying shapes or to replace those that become broken or worn.

An aperture k' in the tool may be engaged by a suitable piece of metal to release the tool from its seat. The numerous indentations on the cams are also an 'advantage in that they multiply the number of strokes of the plugger for each revolution of the drivingspindle, thus giving a very rapid succession of blows, which is desirable in dental work.

Having thus described my invention,what I claim, and desire to secure by Letters Patent, is-

l. In a dental plugger, the combination with the casing, the rotary spindle therein, and the cam operated by the latter and havingaconcentric neck; of a tool-holder extending past the axis of the cam at right angles thereto and bifurcated to embrace said neck and form one bearing, a second bearing for said tool-holder, and means for communicating the movements of the cani-face to the tool-holder.

2. Adental plugger, the combination with the l1andpiece-casing,the rotary spindle therein, and the cam operated by the latter and divided by a groove into two parts having separate cam-faces and connected by a concentric neck; of a tool-holder extending past the axis of the cam at right angles thereto and flattened and bifurcated to embrace said neck and form one bearing, a second bearing for said tool-holdercarried by the casing, and means for communicating the movements of the cam-faces to the tool-holder.

3. In a dental plugger the combination of the handpiece-casingand the rotatable spindle therein, the detachable front casing screwed onto vthe main portion of the handpiece, the check-nut for locking it in position, the cam operatively connected to the spindle and havingjournal-bearing in the detachable casing, the plugger-tool holder also having bearing in said detachable casing and disposed at a right angle to the cam-axis, abutments on the tool-holder to be engaged by the cam and a retractile spring to hold said abutments against the cam substantially as set forth.

4. In a dental plugger, the combination with the rotary spindle, and a cam fast on the latter and divided by a groove into two parts which are connected by a neck concentric with the axis ot' the spindle; of a casing containing the spindle, a tubular guide in the same at right angles to the spindle, a toolllolder whose body moves within said guide and whose inner end is slotted so as to embrace said neck, a projection on said body adapted to be struck by the face of the cam, and a spring opposed to the action of the cam.

5. In a dental plugger, the combination with the rotary spindle, and a cam fast 011 the iatterand divided bya groove into two parts which are connected by a neck concentric with the axis of the spindle; of a casing containing the spindle, a tubular plugin the casing at an angle to the axis of the spindle, a tool-holder guided in the plug and Whose inner end is flattened and slotted so as to embrace said neck, a piu through its body adapted to be struck at both ends by the faces of the cam, and an expansive coiled spring surrounding the body of the tool-holder between said pin and plug.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- FREDERICK W'M. KORB. Witnesses:

WM. A. SKINKLE,

GEORGE C, HANSEN. 

